In a yard-and-stay (burton) rig, why is the SWL of the assembled rig lower than the SWL of either boom used alone in a single swinging configuration?

1. A. Because the cargo runner is reeved as a single whip, reducing mechanical advantage
2. ✓ Because the combined pull on the married falls when the load is between the two booms can be very high, overloading the guys and union purchaseCorrect
3. C. Because the gooseneck fittings on both booms share the compression load equally, reducing each boom's rated capacity
4. D. Because the topping lifts of both booms must be slacked simultaneously, reducing the effective angle of lift